Leadership

Born and raised in Philadelphia, Sr. Mary Jeanne Oesterle attended Catholic school from first grade through university. She holds a bachelor’s degree in education from Gwynedd Mercy College, a master’s degree in education administration from Bloomsburg University, and received administrative certification from Fairfield University. Sr. Mary Jeanne began her career in education in 1967 as a teacher of both elementary and students with special needs. For over thirty years she has served as an education administrator in a number of fine Mercy schools. Her passion is working with and ministering to young people in their formative years.

Sr. Mary Jeanne joined Walsingham Academy in 1990; she served fourteen years as Principal of the Lower School before her appointment as President of the Academy in 2004.

Working in the field of education for over 19 years, Mrs. Mishler has served as an English teacher, athletic coach, instructional coach, youth Catechist, and administrator with students ranging from 3-18 years old. She had the pleasure of working in College Station ISD and opening Wellborn Middle School before transitioning to St. Joseph Catholic School in Bryan, Texas. She sees her purpose as helping people build their capacity for greatness through faith, education, and leadership.  

Her professional career started with her Bachelor of Arts degree in English from Texas A&M University followed by her Master's in Education Administration from the University of Texas at Tyler. As an educator, Mrs. Mishler has worked with thousands of students on what it takes to be successful. From communication and conflict resolution skills, to identifying goals and making plans, to eating healthy and sleeping well, it is her ultimate goal that the students in her care are able build their confidence to take on whatever comes their way. 

Mrs. Mishler loves Dr. Pepper, reading historical fiction, and flowers. She is married to her husband Jeff, and they frequently watch sports events that include one of their four children: Marc, Mason, Mackenzie, and Micah.